The grades on a statistics exam for a sample of students are as follows: 
If A + = 90%-100% A = 80%-89% B+ = 75%-79% B = 70%-74% C+ = 65%-69% C = 60%-64%
D = 55%-59%
F = 0%-54
What is the most common letter grade earned?
Definitions:
Value Chain
A series of activities that a firm operating in a specific industry performs in order to deliver a valuable product or service for the market.
Service Chain
The sequence of processes involved in the production and delivery of a service.
Activities System
The integrated set of actions or tasks performed by an organization or a part of it to achieve its objectives.
Value Chain
A model that outlines a series of activities that businesses perform in order to deliver a valuable product or service for the market.
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